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There are a million things that could bewrong with your set up. Best thing to do is have them run a new calc. double check the sizing. Then i would have them do a good thorough check on it from head...

purchased a new home two years ago and I have been having problems with the AC in the house. The house is 3400 sq feet, has a 3 ton AC (or it may be 3.5... I forget), and no matter what we do, we can...

2.5 tons still sounds a little undersized. Whats the humidity like? Eventually you should be able to get your room temp down to 72-74f. Did he run a heat load calc. on your home? or did he go by rule...